Telephone apparatus



` (No Model.) 2 sheets-sheet 1.

A. STROMB'ERG 8u A; CARLSON'. TELEPHONE APPARATUS A 2 p A @www L m @5 A A Al:

No. 558,859 5&91

(No Model.) Z Sheets-Sheet 2.

A. sT-ROMBBRG A5 A. CARLSON. TELEPHONE APPARATUS.

510,558,859. A Patented-Apr. 21,1895.

nire rares arnNr TELEPHONE APPARATUS'.

SPECIFICATION forming part of Letters Patent No. 558,859, dated April 21, 1896..

Application led October 9,1894.

To rZZ whom it may concern.-

Be it known that we, ALFRED STROMBERG and ANDRov CARLSON, citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Telephone Apparatus, (Case No. 16,) of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

Our invention relates to telephone apparatus; and its object is to provide a more compact telephone set than has been produced heretofore, and to improve and cheapen the construction of the various parts.

We will describe our invention in connection with the accompanying drawings, Vin which- Figure lis a view in elevation of a telephone set embodying our invention, a portion of the casing being removed. Fig. 2 is a sectional view thereof on line 2 2, Fig. 1. Fig. 3 is a detailview showing means for securing the permanent magnets to the pole-pieces 0f the generator. Fig. 4 is a sectional view of the generator on line 4 4, Fig. 2. Fig. 5 is an elevation of a modified form of generator. Fig. 6 is an end view thereof. Fig. 7 is a diagrammatic view illustrating the circuit connections. Figs. S, 9, and 10 are views illustrating modifications of the telephone and generator magnets.

Like letters refer to like parts throughout the dierent figures.

The casing or tube c is mounted upon a base-board b. Within the tube c are provided two bar-magnets c c, provided at the lower end with pole-pieces c2 c3, between which the armature c4 of the generator revolves. Upon the upper ends of the magnets c o are provided the cores c5 of the telephone-coils, the cores extending through the bottom of the trans-n mitter-casing CZ and carrying upon their ends within the casing the telephone-coils c6. The casing CZ is mounted oblique to the tube a, so that the mouthpiece of the transmitter may occupy a convenient position. A cap CZ', upon the under surface of which is secured the diaphragm (Z2, is adapted to be screwed upon the A locking-ring d2 is adapted to be Casin g (Z.

Serial N0. 525,387. (No model.)

screwed upon the casing CZ againstthe cap d to lock the same in any adjusted position.

A cross-piece e of magnetic material eX- tends between the middle portions of the barmagnets c c, the magnetic field of the telephone-transmitter being thus rendered entirelyindependent of the magnetic field of the generator, so that the operation of the generator in no manner affects the transmitter.

In Fig. 8 is illustrated in outline one form of construction in which the bars o c/arepermanently magnetized north and south at their ends in manufacture, so that when the cross-piece e is placed in position each of the bars c c] is in effect divided into two smaller magnets, the north pole of the one being placed in contact with the south pole of the other.

Instead of making the bars c o each of a continuous piece the same result may be secured by placing two smaller magnets. end to end, as indicated by the dotted lines; or, where desired, horseshoe instead of bar magnets may be employed, as shown in Fig. 10,

in which the magnet f affords the field for the generator and the magnet f that for the telephone.

A further modification is shown in Fig. 9, in which the bars c c are magnetized with consequent poles at the middle, the bar c, for instance, having north poles at the ends and a south pole at the middle, while the bar c has south poles at the ends and a north pole at the middle. The effect thus produced is the same as though shorter magnets were placed with like poles in contact, as indicated in dott-ed lines.

Between the pole-pieces o2 o3 are placed distance-pieces 7o lo of non-magnetic material, bolts or screws 7.52 being passed through the pole-pieces o2 o3 and the distance-pieces to complete the structure. The upper distancepiece 7o carries upon its upper surface two projections or blocks 7c3 k4,in which is mounted the shaft Z, which carries the handle Z and the gear-wheel Z2 of the generator. The distancepiece 7c is also provided at the end with a downwardly-extendin g limb 195, in which the other end of the armature-shaft is journaled. One end of the armature-coil is electrically connected with the armature-shaft in a well- IOO . not in use.

known manner, while the other end of the coil is connected with an insulated screw or pin Z4, which makes contact with a spring Z5, mounted upon but insulated from the distance-piece 7c. The permanent magnets may be mounted upon the pole-pieces as illustrated in Fig. 3, in which a metallic strap m passes over the tops of the magnets and is secured by its ends to the pole-piece by screws or bolts m.

A modiiication of the generator embodying the above general principles is shown in Figs. 5 and 6, in which two vertical distance-pieces n n are interposed between the pole-pieces and secured in position by bolts or screws n2 n3, the distance-pieces being provided with holes n4 ui to serve as bearings for the armature-shaft and with holes n0' uT to serve as bearings for the shaft upon which the handle is mounted.

The operating mechanism of the call-bell o' is located with the tube a between the magnets c c and above the cross-piece e, the hammer of the bell extending through the wall of the tube a and adapted to strike the gongs r placed upon the outside of the tube.

Upon the side of the tube a is mounted the support g, adapted to hold the receiver when The telephone-switch is illustrated as composed of a pivoted lever g, adapted to be rotated when the receiver is placed upon the support, the lever carrying` upon its end a cam g2, which moves a plunger g3 inward to thereby move a spring gl to alter the circuit connections. This switch forms p no part of the present invention, being fully described and claimed in Patent No. 530,208, dated December 4, 1894.

The circuit connections are illustrated in Fig. 7. Vhen the telephone is oit its support, circuit may be traced from the binding-post o, to which one side of the telephone-line is connected, to the spring g4, the telephone-coils cG c6 to binding-post o2, through the receiver to binding-post o3, binding-post o4 to opposite side of the line. Then the telephone is hung up, circuit may be traced from binding-post 0 to spring g4, contact 05, spring p, contactp, bell r to binding-post o4, and to opposite side of the line. Vhen it is desired to send calling-currents from the generator, push-button p2 is depressed, thus opening the circuit between spring p and contact p'. The circ-uit of the calling-currents may then be traced from the armature-coils to spring Z5, through bell r to one side of the line, back to binding-post 0, spring g4, contact 05, which is in electrical connection through the permanent magnets,pole-pieces,and distance-pieces with the armature-shaft, to which one end of the armature-coil is connected. The spring p and Contact p' are mounted on the under side of the base-board b, the end of the push-button exten ding through the base-board, whereby it may be conveniently reached.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-n l. The combination with permanent barmagnets, of pole-pieces mounted upon the ends of said magnets between which the armature is adapted to rotate, soft-iron cores eX- tending from the ends of said magnets opposite those upon which said pole-pieces are mounted, the ends of said cores lying in proximity and carrying telephone-coils, a diaphragm mounted opposite the ends of said cores, and a bar of magnetic material connectin g the middle portions of said permanent bar-magnets to afford a path for. the lines of force and render the magnetic fields of the generator and of the telephone independent and distinct, substantially as described.

2. In a magneto-generator, the combination with the pole-pieces c2 c5, of the distance-piece 7.a interposed between the same at the lower end and carrying an upwardly-extending arm formed integral therewith and adapted to receive one end of the armatureshaft,a distance piece 7c interposed between the pole-pieces at the upper end and carrying a downwardlyextending arm formed integral therewith and adapted to support the opposite end of the armature-shaft, said distance-piece k carrying upon its upper face two upwardly-extending arms k3 7a4 adapted to support the countershaft carrying the handle, substantially as described. e

In witness whereof we hereunto subscribe our names this 3d day of October, A. D. 1894.

ALFRED STROMBERG.

ANDROV CARLSON.

Titnesses W. CLYDE JONES, l-'IARRIET G. TEMPLnroN.

IOO 

